Average annual temperature is 14.5 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: -12.1 °C
Number of sunny days: 168 days
Number of rainy days: 185 days
Number of snow days: 12 days
Look at detailed online map of Gaesan
* Weather data for Gaesan South Korea is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 16.3 | 13.8 | 24.9 | 27.2 | 31.6 | 35.5 | 32.5 | 34.7 | 31.0 | 23.3 | 25.3 | 19.2 |
| Average daytime temperature (°C) | 6.2 | 9.1 | 17.5 | 19.9 | 24.3 | 29.1 | 29.3 | 31.0 | 27.5 | 20.8 | 13.7 | 8.5 |
| Average temperature (°C) | 1.0 | 2.8 | 9.8 | 13.5 | 18.6 | 23.1 | 25.9 | 26.7 | 23.1 | 15.3 | 8.8 | 4.2 |
| Average night temperature (°C) | -3.5 | -1.9 | 3.9 | 8.0 | 13.8 | 18.8 | 23.3 | 23.1 | 19.5 | 10.5 | 4.4 | 0.4 |
| Absolute minimum temperature (°C) | -12.1 | -5.7 | -4.3 | 0.6 | 5.7 | 14.4 | 19.5 | 17.7 | 14.1 | 6.4 | -3.3 | -10.3 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.1 | 7.2 | 8.7 | 7.4 | 7.6 | 8.7 | 6.4 | 9.7 | 7.9 | 8.3 | 7.1 | 5.5 |
| Precipitation (mm) | 36 | 26 | 49 | 92 | 181 | 187 | 481 | 218 | 166 | 15 | 94 | 72 |
| Sunny days | 20 | 19 | 23 | 13 | 11 | 14 | 1 | 3 | 10 | 22 | 20 | 12 |
| Rainy days | 8 | 8 | 8 | 17 | 20 | 16 | 30 | 28 | 20 | 9 | 10 | 11 |
| Snow days | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 |
The best time to visit Gaesan during the most sunny months:
The largest precipitation sum in Gaesan is at